Komikanu,
I lived under the bridges of Paris with vagrants and drug-dealers, killers and you name it. I slept in the métro, on the banks of La Seine. I was out of school and out of job and out of society. I stopped living like that and got help. So can you.
Living like this makes you so tired. I remember very vividly the fatigue, this sinking feeling of hopelessness.
Getting out is anything but simple, but it boils down to get busy living or get busy dying.
Get some welfare, go to churches for food, live in shelters - if you´re homeless - until you´re on your feet again. Get free medical attention, be responsible for your body and spirit, and last but not least: Get that résumé done.
Good luck!